English translation of German description:The Racal Instruments Digital Radio Test Set model 6103 is designed to test mobile radio telephones operating on the GSM 900, DCS 1800 and PCS 1900 digital cellular radio systems.
The test set is fully self contained in one portable unit and requires no other external equipment. All functions are available through use of the front panel hard/soft keys and spinwheel. For production test systems, remote control of all tests and readings can be achieved via the IEEE488 (GPIB) interface.
The 6103 provides a range of test and measurement functions to enable quick and easy testing of GSM 900, DCS 1800, and PCS 1900 mobiles in a production or field maintenance environment.
The 6103 contains an

RF generator and

measuring receiver

enabling a comprehensive range of tests to be performed. These include signaling tests, bit error ratio (BER) tests on the mobile’s receiver using the loopback facility and GSM 900 / DCS 1800 / PCS 1900 specific transmitter tests including phase trajectory, power and modulation measurements.
A loopback mode within the 6103 test set allows the audio section of the mobile to be tested via the RF connector. This is complemented by the ability to record voice messages and replay them.
The 6103 can accept an external 10 MHz standard signal.
It provides a variety of timing signals, including bit rate, markers, slot numbers markers and a programmable trigger signal. These signals can be used for synchronizing external equipment and for gating an external spectrum analyzer.